CN1083810C - Spraying material and spraying method employing it - Google Patents

Abstract

A spraying material which comprises cement mortar comprising cement and gypsum as main components, and an accelerating agent comprising calcium aluminate as a main component.

Description

Gunite

The present invention relates to be sprayed on the gunite on the table of soil naturally that exposes in the tunnel (as the tunnel of highway, railway or pipe arrangement), and the spraying method that uses this sand-cement slurry.In order to realize purpose of the present invention, sand-cement slurry mainly comprises grout, clay and concrete.

So far, for the avalanche that the soil naturally that prevents from for example to expose for tunneling is shown, applied for that by the people a kind of spraying is to be mixed with the concrete method of the snap cure of solidifying accelerating chemicals (the patent announcement No.4149/1977 that Japan has authorized).

In this method, gunning concrete is by certain the workshop preparation that is positioned at the excavation place, this workshop weighing and mixed cement, aggregate and water, gunning concrete is transported by transport mixer, utilize concrete pump pressurization feeding, the accelerating chemicals that slip is provided by another supply line under a pipe connecting that is arranged in the pipeline mid-way and pressure mixes, thereby forms the snap cure gunning concrete, and this concrete is sprayed on nature soil table after its thickness reaches prescribed value.

Use this method, the resilience ratio, promptly not bonding with soil table naturally and the amount that comes off and the ratio that sprays total amount are up to 15 to 30% (weight), and the dust situation is serious, causes bad working environment (for example pneumokoniosis) thus, and is troubling.So need resilience than the method low, that dust lacks, but also do not make us well-content gunite or spraying method so far, thereby be badly in need of improving.Conventional accelerating chemicals mainly is made of calcium aluminate or alkali-metal aluminate, thereby is alkaline.So,, need corresponding treatment (the patent announcement No.27457/1981 that Japan has authorized) thus if the connection of dust or resilience and skin adherence just easily cause pachylosis.

Contain the concrete of conventional accelerating chemicals and compare, improved initial strength greatly, but it provides the performance meeting variation of intensity, so that its creep rupture strength is than low 30 to 50% (weight) of the concrete that does not contain accelerating chemicals with the concrete that does not contain accelerating chemicals.

Even like that, in most of the cases, the also enough Gao Erke of initial strength prevent the avalanche of soil table naturally in the conventional NATM method, and if unsettled native naturally, then thicken coating thickness and obtain enough intensity.

But from the viewpoint of economy or operating efficiency, the thickening coating thickness is unfavorable.Particularly when excavation has the tunnel of big cross section,, it is important to improve the concrete intensity in spraying back, make coating thickness thinner, thereby shorten operating time or excavation cycle from the viewpoint of economy and operating efficiency.

To use the short term strength of calcium aluminate in order improving, to improve the content of accelerating chemicals usually as accelerating chemicals.But, if the consumption of accelerating chemicals surpasses 10 parts (weight) every/100 parts of (weight) cement, accelerating chemicals and concrete mixed performance variation, increase the formation of dust thus, or there is such problem, promptly need in spraying process, not add accelerating chemicals, reduce operating efficiency thus owing to use accelerating chemicals in a large number.

In addition, a kind of method of mixing gypsum and calcium aluminate has in advance been proposed, as obtaining spraying back high strength and reducing the method (the patent announcement No.16717/1975 of Japanese unexamined, No.16718/1975 and No.25623/1975) that intensity (comparing with the concrete that does not contain accelerating chemicals) descends.

But when using the accelerating chemicals that calcium aluminate and gypsum constitute, it is 10% (weight) of cement at least that the incorporation of accelerating chemicals requires, in addition when the creep rupture strength of having relatively high expectations at least 20% (weight).

At present, desire is used accelerating chemicals, needs in long tunnel accelerating chemicals to be transported with many other materials, and needs one manually with in the accelerating chemicals adding equipment.Otherwise, be in the spraying method in order to reduce the wet of dust, utilize air pressurized to send into accelerating chemicals and also mix with the concrete that other pressurization is sent into continuously.

The consumption of conventional accelerating chemicals: 10% (weight) that is at most cement is slightly some more, is generally 5 to 10% (weight).So, even once using several m in the spraying operation ³To tens m ³During concrete, be full of in advance by accelerating chemicals, just no longer need in spraying process, add accelerating chemicals, because accelerating chemicals interpolation equipment commonly used has the capacity of about 150kg if accelerating chemicals adds equipment.

But, when using the accelerating chemicals that constitutes by calcium aluminate and gypsum to obtain high strength and low strength decay, need this accelerating chemicals of 10 to 20% (weight) of adding cement amount.So, particularly needs are sprayed the large-scale cross section tunnel of a large amount of gunites, the required rapid hardening dosage of single job is very big, accelerating chemicals adds equipment and often becomes empty, thereby need stop spraying operation and additional accelerating chemicals, if perhaps accelerating chemicals is used up in operating process, the danger that then exists concrete to come off.

Like this,, add a large amount of accelerating chemicalss, exist serious problem in fast as far as possible the spraying of needs to prevent to excavate in the landslide naturally tunnel that collapses, back from the viewpoint of safety and operating efficiency.So, the amount of the accelerating chemicals that the spraying that the urgent need minimizing is added on the spot is required.

And if the accelerating chemicals that adds is a large amount of, itself and concrete mixed performance are understood variation, and intensity is partly changed, and this can cause that concrete comes off, the problem that dust is increased.In view of this, do not reduce blended rapid hardening dosage in the spraying operation, the high strength spraying is practically impossible.

And, in calcium aluminate and the mutual blended accelerating chemicals of gypsum, with gypsum blended calcium aluminate surface it is believed that can with the water that contains, airborne damp vapour or gypsum in free SO ₃Reaction though its mechanism it be unclear that, produces a problem thus, i.e. initialize and final hardened setting time can prolong in the spraying operation, because calcium aluminate and the mixed fate of gypsum have been increased.

If the setting time of gunite is elongated, with the problem that produces is that the concrete that is sprayed on tunnel top is easy to come off, and when fissure water existed, gunite almost can not adhere to, and the resilience ratio increases, thus can not safety, long-term, spray to high strength.

Like this, for the high strength spraying, extensive large vol spraying is impossible, and the installation costs that accelerating chemicals adds equipment is very high.

The present invention has carried out many researchs relevant giving on the high-intensity problem of spraying back concrete, found that, utilizes certain special gunite to spray and can address these problems.The present invention is found to be the basis with this and realizes.

That is to say, the invention provides a kind ofly by being the premix sand-cement slurry of major ingredient with cement and gypsum, is the gunite that the accelerating chemicals of major ingredient constitutes with the calcium aluminate; By being the premix sand-cement slurry of major ingredient with cement and gypsum and being the gunite that the accelerating chemicals of major ingredient constitutes with calcium aluminate and gypsum; By with cement being the sand-cement slurry of major ingredient and the gunite that constitutes as the accelerating chemicals that the calcium aluminate and the gypsum of major ingredient constitutes; Cement wherein is the gunite of fine powder cement and/or fluorine-containing cement; Accelerating chemicals wherein is with calcium aluminate, and composite alkali aluminum soda acid and/or alkaline carbonate are the gunite of major ingredient; Also contain phosphatic gunite in the sand-cement slurry; Also contain the gunite that one or more are selected from the mixing composition of following material, these materials are: amine, fall dust agent, filamentary material, sulphite, water reducer, sclerosis retarding agent, sclerosis accelerating chemicals and ultrafine powder; And comprise the spraying method that uses this gunite.

Now, will be specifically described the present invention.

Being used for cement of the present invention can be for example various silicate cements (Portland cement), for example general, high-early-strength, the ultrafast hard early strength silicate cement of middle heat, the various mixed Portland cements that mix by blast-furnace slag or flyash, fine powder cement and the cement (hereinafter to be referred as fluorine-containing cement) that contains calcium aluminum fluoride.Can use various cement to obtain good initial strength and creep rupture strength.But, be preferably fine powder cement, because may further improve intensity thus.

Be used for its Blang's specific surface of fine powder cement of the present invention than general cement 3,200cm ²/ g is big, and Blang's specific surface is the bigger the better, because reactive behavior is strong.But, consider grindability suitable concerning operating efficiency and economy and classifying capability, Blang's specific surface is with at least 4,500cm ²/ g is advisable, and 5,000 to 8,000cm ²/ g is better.If be lower than 4,500cm ²/ g, intensity can't improve sometimes.Pulverizing cement can be top a kind of in described.

The method for preparing fine powder cement is not particularly limited, and it can be a method of only obtaining fine powder cement by pulverizing, only obtains the method for fine powder cement by classification, has perhaps merged the method that fine powder cement is obtained in pulverizing and classification.Only method can consider that economy and operating efficiency selected afterwards.For example, a kind of method is arranged, wherein, calcining in the kiln of conventional manufacture of cement factory and cement clinker by (for example) ball mill pulverizing, again by classifier with the cement flour classification that obtains, obtain fine powder cement thus.

Be used for fluorine-containing cement of the present invention and promptly contain calcium aluminum fluoride in above-mentioned cement interpolation and mixing.

And, can use a kind of fluorine material that when preparation cement, except that the cement raw material, adds fluorite and so on again, and then the cement that calcining forms in kiln.

Containing calcium aluminum fluoride is a kind of calcium aluminate that contains fluorine, and it can be with CaF ₂Replace structural formula C ₃A, C ₁₂A ₇, CA or CA ₂In at least one CaO (C wherein is CaO and A is Al ₂O ₃) crushed products of the thermal treatment product that makes.Can the utilization structure formula be C also ₃ASO ₃CaF ₂Fluorine-containing blue aspect, CaF wherein ₂Replace C ₄A ₃SO ₃In a CaO.

Desire to obtain the performance that intensity is provided, preferably make with CaF ₂Replace C ₁₂A ₇In the C of a CaO ₁₁A ₇CaF ₂, or with CaF ₂Replace C ₄A ₃SO ₃In the structural formula of a CaO be C ₃ASO ₃CaF ₂Fluorine-containing blue aspect.

As fluorine-containing inorganic component, contain the content of calcium aluminum fluoride in fluorine-containing cement and be preferably per 100 parts of 5 to 100 parts of (weight) cement (weight), 10 to 60 parts (weight) is better.If be less than 5 parts (weight), can't obtain the effect of sufficient fluorine-containing cement, if surpass 100 parts (weight), can weaken the performance that intensity is provided.

Being used for gypsum of the present invention adds in order to make concrete after the spraying have high strength.This gypsum can be dehydrated gyp-, hemi-hydrated plaster and two hydrated gypsum, it can be used alone or as a mixture.Wherein, for the purpose of obtaining the performance that intensity is provided, be advisable to use dehydrated gyp-.

The granular size of gypsum can be identical with the used general value of Portland cement, and for example, Blang's specific surface is greater than 3,000cm ₂/ g, and thin more good more.

The gypsum consumption is advisable with per 100 parts of (weight) cement 1 to 25 part (weight), and 5 to 20 parts (weight) is better.But when using fluorine-containing cement, gypsum content wherein is advisable with per 100 parts of (weight) cement 1 to 25 part (weight), and 5 to 20 parts (weight) is better.If be less than 1 part (weight), be difficult to improve the performance that creep rupture strength is provided, if surpass 25 parts (weight), can the sclerosis of delay initial stage, reduce with the bounding force of soil naturally, perhaps concrete can be in the long time expansion and that concrete is easy to is cracked.

And, in the present invention,, can in accelerating chemicals, add gypsum in order to improve creep rupture strength.At this moment, comprised the sand-cement slurry of cement and gypsum, can reduce the amount of the accelerating chemicals that constitutes by calcium aluminate and gypsum by use.

The gypsum that adds accelerating chemicals is advisable with per 100 parts of (weight) calcium aluminates 10 to 200 parts (weight), and 50 to 150 parts (weight) is better.If content is less than 10 parts (weight), can not obtain effect of sufficient, if surpass 200 parts (weight), promote that performance can reduce.When sand-cement slurry was mixed with accelerating chemicals, the total amount of gypsum was advisable with per 100 parts of (weight) cement 1 to 25 part (weight).If total content is less than 1 part (weight), can't obtain to provide fully intensity effect, if surpass 25 parts (weight), concrete is easy to expand and cracked.

Being used for accelerating chemicals of the present invention is major ingredient with the calcium aluminate.

Being used for calcium aluminate of the present invention is with CaO raw material, Al ₂O ₃The mixture of raw material etc. is calcined in kiln or thermal treatment such as furnace melting makes, and it is a kind of promotion composition that can make concrete hardening in the starting stage.

The calcium aluminate inorganic composition can (for example) be by structural formula C ₃A, C ₁₂A ₇, CA or CA ₂(C wherein is CaO, and A is Al ₂O ₃) expression calcium aluminate thermal treatment after crushed products.In addition, other inorganic composition can be to contain SiO ₂Calcium aluminium silicate, contain halid C ₁₁A ₇CaX ₂(X wherein is the halogen of fluorine and so on) is (for example with CaF ₂Replace C ₁₂A ₇, contain SO ₃The C of composition ₄A ₃SO ₃In a CaO), high-alumina cement, the part solid solution has the alkali-metal calcium aluminate of sodium, potassium or lithium.Wherein, from reactive behavior, be preferably quench treatment C ₁₂A ₇The thermal treatment product and the amorphous calcium aluminate that obtains.

To promote performance and the viewpoint that initial strength is provided, the granular size of calcium aluminate is with Blang's value at least 3,000cm ²/ g is advisable, and at least 4,000cm ²/ g is better.If Blang's value is lower than 3,000cm ²/ g, then acceleration characteristics and initial strength can reduce.

The consumption of calcium aluminate is advisable with per 100 parts of (weight) cement 1 to 20 part (weight), and 5 to 15 parts (weight) is better.If consumption is less than 1 part (weight), be difficult to harden in the early stage, if surpass 20 parts (weight), impair the performance that creep rupture strength is provided.

Among the present invention,, can in calcium aluminate, mix alkali metal aluminate or the anti-carbonate of basic metal as accelerating chemicals for sclerosis of improvement initial stage or early strength.

Being used for alkali metal aluminate of the present invention can the sclerosis of promotion initial stage.Alkali metal aluminate can be for example lithium aluminate, sodium aluminate and potassium aluminate, it can be used alone or as a mixture.The consumption of alkali metal aluminate is advisable with per 100 parts of (weight) calcium aluminates 1 to 50 part (weight), and 2 to 25 parts (weight) is better.If consumption is less than 1 part (weight), can't obtain effect of sufficient, if surpass 50 parts (weight), impair the performance that creep rupture strength is provided.

Be used for alkaline carbonate of the present invention and can improve early strength.The carbonic acid an alkali metal salt can be (for example) yellow soda ash, salt of wormwood or sodium bicarbonate, and these carbonate can be used alone or as a mixture.When alkaline carbonate is mixed use with alkali metal aluminate, more can improve fast hard ability.

The consumption of alkaline carbonate is advisable with per 100 parts of (weight) calcium aluminates 0.5 to 200 part (weight), and 1 to 50 part (weight) is better.If be less than 0.5 part (weight), can't obtain effect of sufficient, if surpass 200 parts (weight), creep rupture strength can reduce.

The consumption of accelerating chemicals is not particularly limited, but is advisable with per 100 parts of (weight) cement 1 to 20 part (weight), and 5 to 15 parts (weight) is better.If be less than 1 part (weight), be difficult to harden in the early stage, if surpass 20 parts (weight), impair the performance that improves creep rupture strength.

Among the present invention, can also mix the mixing composition that one or more are selected from following material, these materials are: phosphoric acid salt, amine, depositing dust agent, filamentary material, sulphite, water reducer, sclerosis retarding agent, sclerosis accelerating chemicals and ultrafine powder.

Be used for the pressure feed performance that phosphoric acid salt of the present invention can improve gunning concrete.Particularly, by adding phosphoric acid salt, when concrete is the kneading state,, also can in long period, keep the flowability of gunning concrete even only use a spot of water.

Phosphoric acid salt is a kind of sclerosis retarding agent.But different with the sclerosis retarding agent of organic acid or alkaline carbonate and so on is only to need just can obtain tangible carryover effects on a small quantity, so even only also can guarantee sufficient flowability with a spot of water.When using organic acid or alkaline carbonate, if the consumption of water is few, just need a large amount of this retarding agents make concrete have flowability, the result, even use a large amount of accelerating chemicalss, the performance that intensity is provided is variation still.But phosphoric acid salt does not have significant side effects to the strength property that provides that adds behind the accelerating chemicals.

Phosphoric acid salt comprises for example sodium salt and the sylvite of phosphoric acid, tetra-sodium, trimethylammonium phosphoric acid, hexamethyl phosphoric acid, tripolyphosphate and four polyphosphoric acids.For example, uncle's sodium phosphate, secondary sodium phosphate, tertiary sodium phosphate, uncle's potassiumphosphate, secondary potassiumphosphate, uncle's potassiumphosphate, trisodium phosphate, potassium pyrophosphate, front three sodium phosphate, front three potassiumphosphate, pregnancy sodium phosphate, pregnancy potassiumphosphate, tripoly phosphate sodium STPP, Potassium tripolyphosphate, sodium tetrapolyphosphate, four Rapisols.Phosphoric acid salt can be used alone or as a mixture.Wherein, consider, be advisable to use uncle's sodium phosphate and tripoly phosphate sodium STPP from strength property is provided.

Phosphatic granular size has no particular limits, but considers from solubleness, is advisable with 0.3mm at the most.

In addition, phosphoric acid salt can mix use with following organic acid or alkaline carbonate.

Per 100 parts of phosphatic consumptions of (weight) cement are advisable with 0.05 to 5 part (weight), and 0.2 to 3 part (weight) is better.If be less than 0.05 part (weight), can't obtain sufficient flowability, if surpass 5 parts (weight), will impair the performance that intensity is provided.

Adding the used amine of the present invention is to keep its inherent hardening capacity in order to improve fast gunning concrete firmly simultaneously with native naturally bounding force, reduces springback capacity thus, so that the strength property that provides that adds the accelerating chemicals generation to be provided.

When amine and accelerating chemicals or sclerosis accelerating chemicals mix use, can improve concrete bounding force and keep its inherent hardening capacity simultaneously.And amine also has the effect that the degradation of creep rupture strength is provided when minimizing is a large amount of uses accelerating chemicals.

This class amine comprises for example Trimethylamine, diethylamide, triethylamine, propyl group amine, allyl amine, cyclo-hexylamine, cyclobutyl amine, monoethanolamine, diethanolamine, trolamine, hexamethylene-diamine, pyridine and aniline.This class amine can be used alone or as a mixture.Wherein, be preferably monoethanolamine or the trolamine that use and water or cement and so on alkaline matter has good affinity.

The consumption of amine is advisable with per 100 parts of (weight) cement 0.5 to 10 part (weight), and 1 to 5 part (weight) is better.If be less than 0.5 part (weight), the strength property that provides when hardening capacity, bounding force and adding accelerating chemicals can variation, if surpass 10 parts (weight), can impair provides strength property.

Being used for depositing dust agent of the present invention provides the resilience or the minimizing that reduce gunning concrete to disseminate to airborne at abundant as yet accelerating chemicals or the cement component of mediating of spraying operation.

This class depositing dust agent comprises for example ether of cellulose, for example methylcellulose gum, ethyl cellulose, Natvosol, hydroxypropylcellulose, hydroxyethylmethyl-cellulose, Vltra tears and hydroxyethyl ethylcellulose, natural polymer, for example arginine, Sodium L-arginate and casein, the multipolymer of ethene polymers or vinyl-acetic ester, ethene, vinylchlorid, methacrylic acid, vinylformic acid, sodium acrylate and unsaturated carboxylic acid etc., and vinyl acetate polymer or its have the emulsion of saponification resultant of the multipolymer of polyvinyl alcohol skeleton structure.These depositing dust agent can be used alone or as a mixture.Wherein, be preferably ether of cellulose, because they are difficult for influencing the initial stage sclerosis.

The consumption of depositing dust agent is advisable with per 100 parts of (weight) cement 0.01 to 1 part (weight), and 0.05 to 0.5 part (weight) is better.If be less than 0.01 part (weight), can't obtain sufficient dustproof effect, if surpass 1 part (weight), the strength property that provides of gunning concrete can be influenced.

It can be inorganic or organic being used for filamentary material of the present invention, and they provide improves gunning concrete shock strength or elastic effect.

Consider and force feeding performance or mixed performance, the length of filamentary material is advisable with 50mm at the most, and 0.5 to 30mm is better.If length surpasses 50mm, spraying cement can stop up in forcing the feeding process.

Inorganic fibers comprises for example glass fibre, carbon fiber, asbestos, asbestos, ceramic fiber and steel fiber, and organic fibrous material comprises for example polyvinyl alcohol fiber, tynex, paper pulp, hemp, wood wool and wood chip.These filamentary materials can be used alone or as a mixture.Wherein, consider, use steel fiber or polyvinyl alcohol fiber better from economic angle.

The consumption of filamentary material is advisable with per 100 parts of (weight) cement 0.5 to 7 part (weight), and 1 to 5 part (weight) is better.If be less than 0.5 part (weight), can't obtain effect of sufficient, if surpass 7 parts (weight), the mobile reduction.

Be used for the slump reduction in time that sulphite of the present invention can prevent gunning concrete effectively, and improve concrete intensity thus.This sulphite comprises sulphite and hydrosulphite and pyrosulfites such as Sodium Pyrosulfite, potassium pyrosulfite such as sodium bisulfite, Potassium hydrogen sulfite such as S-WAT, potassium sulfite and calcium sulfite.These sulphite can be used alone or as a mixture.Wherein, consider the performance that intensity is provided, use S-WAT or potassium sulfite better.

The consumption of sulphite is advisable with per 100 parts of (weight) cement 0.05 to 2 part (weight), and 0.07 to 1 part (weight) is better.If be less than 0.05 part (weight), be difficult to prevent slump in time reduction or be difficult to improve intensity.If surpass 2 parts (weight), delay performance can be excessive and influence provides strength property.

Water reducer is used to improve the flowability of sand-cement slurry, and it can use with liquid or powder type.Water reducer can be (for example), polyol derivative, Sulfite lignin or derivatives thereof, or high-performance water reducing agent.These water reducers can be used alone or as a mixture.It wherein, is preferably the use high-performance water reducing agent, because can produce high-intensity performance.

Use high-performance water reducing agent can reduce coating thickness, improve fast hard ability, reduce rapid hardening dosage or dust formation amount, reduce the resilience ratio as far as possible, and effectively improve quantity for spray.

High-performance water reducing agent can be the formaldehyde condensation products of (for example) alkylallyl sulfonate, naphthalenesulfonate or melamine sulfonate, or the polyocarboxy acid type polymkeric substance.These high-performance water reducing agents can be used alone or as a mixture, and can use with liquid or form of powder.Wherein, be preferably the formaldehyde condensation products of use naphthalenesulfonate or the mixture of naphthalenesulfonate formaldehyde condensation compound and condensate of melamine and formaldehyde.

The consumption of high-performance water reducing agent solid constituent is advisable with per 100 parts (weight) 0.05 to 3 part (weight), and 0.1 to 2 part (weight) is better.If be less than 0.05 part (weight), can't obtain effect of sufficient, if surpass 3 parts (weight), the viscosity of sand-cement slurry is too high and reduce operating efficiency.

In addition,, can add the sclerosis retarding agent of organic acid or an alkali metal salt and so on, or the sclerosis accelerating chemicals in order to regulate the setting time of sand-cement slurry, for example as the alkali metal hydroxide of sodium hydroxide and so on, white lime, or the vitriol of alum and so on.

The sclerosis retarding agent can prolong the setting time of sand-cement slurry, and organic acid can be (for example) glyconic acid, tartrate, citric acid, toxilic acid or lactic acid, or their sodium salt or sylvite.

The organic acid consumption is advisable with per 100 parts of (weight) cement 0.01 to 3 part (weight), and 0.05 to 2 part (weight) is better.If be less than 0.01 part (weight), can't obtain effect of sufficient, if surpass 3 parts (weight), the sclerosis meeting is excessively made the sclerosis variation.

The consumption of alkaline carbonate is advisable with per 100 parts of (weight) cement 0.01 to 10 part (weight), and 0.1 to 5 part (weight) is better.If be less than 0.01 part (weight), can't obtain effect of sufficient, if surpass 10 parts (weight), the sclerosis meeting is made the sclerosis variation by excessive deferral.

In order to improve the sclerosis retardation capability, be preferably use organic acid is mixed use with the sclerosis retarding agent with alkaline carbonate.At this moment, alkaline carbonate is advisable with per 100 parts of (weight) organic acids 10 to 1000 parts (weight), and 50 to 700 parts (weight) is better.If be less than 10 parts (weight), can't obtain effect of sufficient, if surpass 1000 parts (weight), the sclerosis meeting is made the sclerosis variation by excessive deferral.

Mix and use the sclerosis retarding agent of organic acid and alkaline carbonate to be advisable with per 100 parts of (weight) cement 0.01 to 10 part (weight), 0.1 to 5 part (weight) is better.If be less than 0.01 part (weight), can't obtain effect of sufficient, if surpass 10 parts (weight), the sclerosis meeting is made the sclerosis variation by excessive deferral.

The sclerosis accelerating chemicals can the sclerosis of acceleration initial stage.The sclerosis accelerating chemicals can be the alkali metal hydroxide of sodium hydroxide and so on for example, white lime, or the vitriol of alum and so on.These sclerosis accelerating chemicalss can be used alone or as a mixture.The consumption of sclerosis accelerating chemicals is advisable with per 100 parts of (weight) cement 0.05 to 20 part (weight), and 0.1 to 10 part (weight) is better.If use 0.05 part (weight), can't obtain effect of sufficient, if surpass 20 parts (weight), provide the performance of creep rupture strength to can not get improving.

The mean particle size that is used for ultrafine powder of the present invention is at most 10 μ m, and it can reduce the amount of cement, reduces dust and improves concrete pressure feeding performance.Ultrafine powder can be for example fine powder slag, flyash, wilkinite, kaolin or silica powder like this.This class ultrafine powder can be used alone or as a mixture.Wherein, consider, use better quartzy from the strength property angle is provided.

The consumption of ultrafine powder is advisable with per 100 parts of (weight) cement 1 to 100 part (weight), and 2 to 30 parts (weight) is better.If be less than 1 part (weight), can't obtain effect of sufficient, if surpass 100 parts (weight), can postpone sclerosis or curing.

The consumption of water is advisable with per 100 parts of (weight) cement 35 to 60 parts (weight), and 40 to 50 parts (weight) is better.If be less than 35 parts (weight), can't thorough mixing, if surpass 60 parts (weight), can't obtain enough intensity, and may need a large amount of accelerating chemicalss.

Be used for aggregate of the present invention, preferably have low water absorbable and high cohesion as coarse aggregate or fine aggregate, but not special restriction.

Consider the pressure feeding performance of utilizing pump, coarse aggregate is with maximum diameter being advisable of 20mm at the most, maximum diameter 6 to 15mm better.

Fine aggregate is with maximum diameter being advisable of 5mm at the most, and it can be a river sand, mountain sand, lime sand or quartz sand.

Among the present invention, mix the not special restriction of method of various materials, as long as with cement and gypsum, and phosphoric acid salt (if necessary) be pre-mixed before accelerating chemicals mixes.Adding phosphoric acid salt in sand-cement slurry is because it can improve the flowability of gunning concrete.

Blending means for example can be, adds the gypsum of specified quantitative in advance in cement, or adds gypsum when mediating concrete.In addition, by stipulating sulphur trioxide (SO in the cement among the JIS ₃) content is 3.0 to 4.5% (weight), may mention a kind of method, when wherein preparing cement in manufacture of cement factory, the blended amount of gypsum surpasses this value of stipulating among the JIS.

According to spraying method of the present invention, from the viewpoint of required physicals, economy and operation efficiency, spray operation and can use the dry cement mortar that contains cement, contain the sand-cement slurry of cement and water, or cement sand slurry or concrete, can use dried spraying method or wet spray.

Dried spraying method for example can be, cement, gypsum, aggregate and accelerating chemicals (if necessary) mixed and utilize the air pressure feeding, and water is added by a road the in-Y tube mid-way (for example), mixture sprays with dampness then, perhaps, cement and aggregate (if necessary) mixes and utilizes the air pressure feeding, adds gypsum, accelerating chemicals and water in turn in certain mid-way, and mixture sprays with dampness then.

Wet spray for example can be, with cement, and gypsum, aggregate (if necessary) and water mix, and mediate and utilize the air pressure feeding, add accelerating chemicals, spraying mixt then mid-way (for example) by a road the in-Y tube.In addition, in wet system spraying method, water is added in the sand-cement slurry.

Amine, depositing dust agent, filamentary material, sulphite, water reducer, sclerosis retarding agent, sclerosis accelerating chemicals and ultrafine powder can be mixed with sand-cement slurry or accelerating chemicals, they can be added into a kind of in sand-cement slurry and the accelerating chemicals or its both.But, in order to improve intensity, prevent resilience and control sclerosis, preferably they are added in the sand-cement slurry.Do not limit blending means especially, as long as spraying is the fast hard gunning concrete that contains these materials.

Spraying method of the present invention can adopt conventional spraying equipment.Propose, spray pressure is 2 to 5kg/cm ², spraying rate is 4 to 20m ³/ hr.

As long as be enough to and spray, do not limit spraying equipment especially.For example, concrete pressure feeding can be used for example " Ariber 280 " board of Ariber company manufacturing, and the pressure feeding of accelerating chemicals can be used for example accelerating chemicals pressure pay-off " Natomucreet ".

Sand-cement slurry when accelerating chemicals and gypsum difference force feed, can be used several different methods, and not special restriction needs only this method difference force feed sand-cement slurry, accelerating chemicals and gypsum, and they are mixed mutually.

For example, may mention a method, wherein use concrete pump force feed sand-cement slurry, in the mid-way, be connected into two Y pipe, add accelerating chemicals by pipeline wherein, go into gypsum by another pipeline force feed, thus they are mixed with sand-cement slurry, perhaps, the water-free sand-cement slurry of pressure feed in the mid-way, is connected into three Y pipes, add accelerating chemicals by a pipe, another pipe adds gypsum, and a pipe adds entry again, merges then and mixes.

Used water can mix with sand-cement slurry, gypsum or accelerating chemicals by the independent pipeline of himself in the spraying method of sand-cement slurry, accelerating chemicals and gypsum difference force feed, or mix adding with them, as long as the last water yield is suitable than cement amount to forcing the fast hardening concrete under the feeding condition.

The spraying method that adds sand-cement slurry, accelerating chemicals and gypsum under the pressure respectively has no particular limits.But when doing spraying, the method for a particularly suitable is cement, fine aggregate and coarse aggregate to be mixed being incorporated in feeding under the pressure, in the mid-way, be connected into three Y pipes, add accelerating chemicals by a pipe, another pipe adds gypsum, and a pipe adds entry again, and the mixture of formation sprays under dampness.In dried spraying method, be easy to form dust, so can mix the depositing dust agent in advance.

In addition, be in the spraying method wetting, can use a kind of method, wherein, cement, fine aggregate, coarse aggregate and water is added into, pinch and be incorporated in feeding under the pressure, in the mid-way, is connected into two Y pipes, add accelerating chemicals by a pipe, another pipe adds gypsum, spraying mixt then.

Spraying condition when force feed sand-cement slurry, accelerating chemicals and gypsum is not particularly limited respectively.But, consider mixing efficiency, preferably isobaric basically sand-cement slurry, gypsum and the accelerating chemicals of adding.

Now, further specify the present invention with reference to embodiment.But, it must be understood that the present invention is not limited to specific embodiment.

Embodiment 1

The material of applying unit amount, i.e. 400kg/m ³Cement, 1055kg/m ³Fine aggregate, 713kg/m ³Coarse aggregate and 200kg/m ³Water by in the table 1 add-on of per 100 parts of (weight) cement being sneaked into gypsum, is produced gunning concrete thus.

Utilize " Ariber 280 " this gunning concrete of spraying machine force feed, utilize accelerating chemicals adding machine " Denkanatomucreet " from the one Y pipe of middle position a road by in the table 1 add-on of per 100 parts of (weight) cement being sneaked into the accelerating chemicals that calcium aluminate constitutes, produce fast hard gunning concrete thus.

With 4m ³The speed of/hr sprays this fast hard gunning concrete on framework, measure the ultimate compression strength in each period then.The results are shown in table 1.

Material therefor

Cement a: commercially available general silicate cement, Blang's specific surface: 3200cm ²/ g, proportion: 3.16

Gypsum: commercially available dehydrated gyp-, Blang's specific surface: 5400cm ²/ g

Fine aggregate: sand, Japanese Himekawa, the river sand that Niigata-ken produces, surface water content: 5%, proportion 2.61

Coarse aggregate: gravel, rubble, maximum diameter: 15mm at the most, surface drying, proportion 2.65

Water: tap water, 20 ℃

Calcium aluminate: C ₁₂A ₇The thermal treatment product of forming quench and amorphous substance, Blang's specific surface area: 5900cm ²/ g, proportion: 2.90

Measuring method

Ultimate compression strength: with the gunning concrete that makes be sprayed on a 25cm wide * long the pulling out of 25cm draw on the framework and a 50cm wide * the thick framework of 50cm length * 20cm on.

3 hours or less than 3 hours after, use one to pull out and draw the framework test to measure with test specimen.One probe is covered by fast hard gunning concrete from pulling out the surface of drawing framework, and probe is extracted from the framework back side, so measures force pulling, and is calculated as follows ultimate compression strength:

Ultimate compression strength=force pulling * 4/ test specimen surface-area

After the time more than 1 day or 1 day, sampling from 50cm wide * test specimen that the diameter 5cm of the framework that 50cm length * 20cm is thick * 10cm grows measured by one 20 tons pressure tester, obtains its ultimate compression strength.

Table 1

Test No.	Gypsum	Accelerating chemicals	Ultimate compression strength (N/mm 2)					Annotate
									1h	3h	1d	7d	28d
			1-1 1-2 1-3 1-4 1-5 1-6	0 1 5 10 15 25	0 0 0 0 0 0	0.0 0.0 0.0 0.0 0.0 0.0	0.0 0.0 0.0 0.0 0.0 0.0							- - - - - -	18.5 18.5 18.5 18.7 18.8 18.8	41.3 41.4 42.2 44.6 45.3 46.8	Contrast contrast contrast contrast contrast contrast
1-7 1-8 1-9 1-10 1-11 1-12	0 1 5 10 15 25	2 2 2 2 2 2						0.0 0.1 0.3 0.4 0.4 0.5	0.0 0.6 0.7 0.8 0.8 0.8	- - - - - -	18.6 19.7 22.3 23.0 23.3 23.5	38.4 41.9 43.6 45.7 46.6 47.8	The edition with parallel text invention is of the present invention
			1-13 1-14 1-15 1-16 1-17 1-18	0 1 5 10 15 25	5 5 5 5 5 5	0.2 0.5 1.2 1.7 2.0 2.2	0.5 1.0 2.4 4.3 4.7 5.0							8.9 10.3 13.6 14.2 14.5 15.0	19.3 20.6 28.3 31.7 33.9 34.2	36.2 42.3 47.8 49.5 53.1 54.9	The edition with parallel text invention is of the present invention
1-19 1-20 1-21 1-22 1-23 1-24	0 1 5 10 15 25	10 10 10 10 10 10						1.2 1.8 2.1 3.0 3.4 3.6	1.7 2.0 3.6 6.0 6.6 6.9	10.0 12.2 15.3 16.0 17.5 17.9	20.5 22.3 29.5 32.6 38.4 39.2	33.6 42.6 46.8 53.0 55.0 56.3	The edition with parallel text invention is of the present invention
			1-25 1-26	0 1	20 20	1.9 2.3	2.5 3.1							11.3 16.2	22.7 28.6	32.2 43.1	The edition with parallel text invention

1-27 1-28 1-29 1-30

5 10 15 25

20 20 20 20

3.2 4.3 5.7 7.2

5.2 6.6 8.3 10.3

19.5 20.6 23.3 22.1

34.7 40.4 42.7 41.8

56.4 57.7 58.9 53.0

Of the present invention

● " h " expression " hour ", " d " expression " my god "

● " gypsum " and " accelerating chemicals " is by umber (weight) expression to per 100 parts of (weight) cement

● "-" expression of " ultimate compression strength " can't be taken a sample because of undercapacity

Embodiment 2

Test by the mode among the embodiment 1, different is that the cement in 100 parts of (weight) tables 2 and the gypsum of the amount of Table 2 are mixed into gunning concrete, and the accelerating chemicals consumption in per 100 parts of (weight) cement is as shown in table 2, produces fast hard gunning concrete thus.

But, used fine powder cement be ordinary Portland cement through ball mill pulverizing, then by classifier.

Used material

Cement b: fine powder cement, the crushed products of commercially available ordinary Portland cement, Blang's specific surface: 4,500cm ²/ g, proportion: 3.16

Cement c: fine powder cement, the crushed products of commercially available ordinary Portland cement, Blang's specific surface: 5,300cm ²/ g, proportion: 3.16

Table 2

Test No.	Cement	Gypsum	Accelerating chemicals	Ultimate compression strength (N/mm 2)					Annotate
										1h	3h	1d	7d	28d
				2-1 2-2	a b	10 10	0 0	0.0 0.0							0.0 0.0	- -	18.7 19.5	41.3 41.4	The contrast contrast
2-3 2-4 2-5	b b b	0 10 25	5 5 5						0.2 1.8 2.5	0.6 4.8 5.9	9.5 14.7 17.3	22.0 32.2 34.6	39.1 52.0 57.2	Edition with parallel text invention the present invention
				2-6 2-7 2-8	b b b	0 10 25	10 10 10	1.5 3.3 4.1							1.9 6.4 7.7	10.5 17.2 18.9	22.3 34.0 41.0	39.2 56.2 59.5	Edition with parallel text invention the present invention
2-9 2-10 2-11	b b b	0 10 25	20 20 20						1.9 4.5 8.0	2.7 7.1 11.7	12.1 21.2 23.6	23.0 42.0 44.3	35.2 58.8 56.1	Edition with parallel text invention the present invention
				2-12	c	10	0	0.0							0.0	-	20.5	48.6	Contrast
2-13	c	0	5						0.4	0.8	10.1	23.7	41.6	Contrast

2-14 2-15	c c	10 25	5 5	2.0 3.0	5.6 6.8	16.3 18.0	33.8 37.2	54.7 59.4	Of the present invention
										2-16 2-17 2-18	c c c	0 10 25	10 10 10	1.7 4.2 4.6	2.1 7.5 8.9	11.5 18.7 19.6	23.3 35.7 42.3	40.3 58.6 63.7	Edition with parallel text invention the present invention
2-19 2-20 2-21	c c c	0 10 25	20 20 20	2.3 5.1 9.0	3.0 8.8 12.3	13.0 23.5 25.5	24.4 44.1 46.3	35.6 61.5 56.2	Edition with parallel text invention the present invention

● " h " expression " hour ", " d " expression " my god "

● " gypsum " and " accelerating chemicals " is by umber (weight) expression to per 100 parts of (weight) cement

● "-" expression of " ultimate compression strength " can't be taken a sample because of undercapacity

Embodiment 3

Test by the mode among the embodiment 1, different is is mixed into gunning concrete with the gypsum of 100 parts of (weight) cement d and the amount of Table 3, accelerating chemicals consumption in per 100 parts of (weight) cement is as shown in table 3, produces fast hard gunning concrete thus and the results are shown in table 3.

Used material

Cement d: fine powder cement, the crushed products of commercially available ordinary Portland cement, Blang's specific surface: 6,900cm ²/ g, proportion: 3.16

Table 3

Test No.	Gypsum	Accelerating chemicals	Ultimate compression strength (N/mm 2)					Annotate
									1h	3h	1d	7d	28d
			3-1	0	0.0	0.0	0.0							-	19.9	46.8	Contrast
3-2 3-3 3-4 3-5 3-6 3-7	0 1 5 10 20 25	10 10 10 10 10 10						2.1 2.5 3.8 6.0 7.0 7.8	3.6 4.6 5.6 9.7 10.5 11.0	14.1 13.3 16.0 19.9 20.5 21.6	26.0 25.0 27.3 39.5 41.1 45.1	43.5 45.8 55.6 65.6 70.7 71.1	The edition with parallel text invention is of the present invention
			3-8 3-9 3-10 3-11 3-12	10 10 10 10 10	0.0 1.0 5.0 15 20	0.0 1.8 3.2 6.5 6.8	- 6.6 17.5 24.0 26.7							21.7 23.0 38.7 45.0 48.6	49.3 51.7 63.2 68.0 68.8	49.3 51.7 63.2 68.0 68.8	Edition with parallel text invention the present invention of the present invention
3-13 3-14	1 1	1.0 20						0.1 3.8	0.2 6.1	- 18.5	19.5 32.3	47.6 46.9	The edition with parallel text invention

3-15 3-16 3-17 3-18 3-19 3-20

5 5 20 20 25 25

5.0 15 5.0 15 1.0 20

2.2 6.0 6.0 7.1 0.1 11.0

5.0 8.6 10.2 10.8 0.3 12.1

16.2 22.7 20.5 24.5 20.1 29.0

32.2 41.3 40.9 46.7 45.0 41.2

59.5 65.2 68.0 70.6 68.6 62.9

Of the present invention of the present invention

● " h " expression " hour ", " d " expression " my god "

● " gypsum " and " accelerating chemicals " is by umber (weight) expression to per 100 parts of (weight) cement

● "-" expression of " ultimate compression strength " can't be taken a sample because of undercapacity

Embodiment 4

Mode according to embodiment is tested, and different is that the material of unit vol is 1047kg/m ³Fine aggregate and 709kg/m ³Coarse aggregate, 100 parts of (weight) cement, and the gypsum of the amount of Table 4 is mixed into gunning concrete, the accelerating chemicals consumption in per 100 parts of (weight) cement is as shown in table 4, produces fast hard gunning concrete thus.The results are shown in table 4.

Used material

Cement e: fine powder cement, the crushed products of commercially available Type B portland blast-furnace slag cement, Blang's specific surface: 5,200cm ²/ g, proportion: 3.04

Table 4

Test No.	Gypsum	Accelerating chemicals	Ultimate compression strength (N/mm 2)					Annotate
									1h	3h	1d	7d	28d
			4-1	0	0.0	0.0	0.0							-	17.0	40.0	Contrast
4-2 4-3 4-4	0 10 25	5 5 5						0.1 0.9 1.3	0.3 3.3 4.6	8.9 10.5 14.4	17.6 23.0 25.1	38.4 51.0 54.3	Edition with parallel text invention the present invention
			4-5 4-6 4-7	0 10 25	10 10 10	0.7 2.4 3.0	1.4 4.1 6.8							10.0 14.6 16.8	19.1 26.0 36.1	38.6 56.1 59.0	Edition with parallel text invention the present invention
4-8 4-9 4-10	0 10 25	20 20 20						1.0 3.4 6.1	1.8 6.5 9.0	11.0 17.3 20.1	20.5 35.7 36.0	30.6 59.0 58.5	Edition with parallel text invention the present invention

● " h " expression " hour ", " d " expression " my god "

● " gypsum " and " accelerating chemicals " is by umber (weight) expression to per 100 parts of (weight) cement

● "-" expression of " ultimate compression strength " can't be taken a sample because of undercapacity

Embodiment 5

Mode according to embodiment 1 is tested, and different is that the cement of the unit vol of using is 400kg/m ³The fluorine-containing cement that calcium aluminum fluoride mixes that contains by 100 parts of (weight) cement and the amount of Table 5, with 100 parts of (weight) fluorine-containing cement and 10 parts of (weight) gypsum and 0.5 part (weight) sclerosis retarding agent A, be mixed into gunning concrete by the cement composition in 100 parts of (weight) fluorine-containing cement, add 10 parts of accelerating chemicalss that (weight) is made up of calcium aluminate in per 100 parts of (weight) fluorine-containing cement, produce fast hard gunning concrete thus.The results are shown in table 5.

Used material

Contain calcium aluminum fluoride: major ingredient: C ₁₁A ₇CaF ₂, Blang's specific surface: 5600cm ²/ g, proportion: 2.91

Sclerosis retarding agent A: organic acid, citric acid, commercially available prod

Table 5

Test No.	The amount that contains calcium aluminum fluoride *1	Ultimate compression strength (N/mm 2)			Annotate
						1h	7d	28d
		5-1	5	3.3					33.6	54.0	The present invention
5-2	10				4.0	37.4	55.9	The present invention
		5-3	20	5.5					41.3	58.4	The present invention
5-4	60				6.7	46.9	58.0	The present invention
		5-5	100	6.8					47.5	55.7	The present invention

● " h " expression " hour ", " d " expression " my god "

^*1: per 100 parts of (weight) cement are contained calcium aluminum fluoride umber (weight)

Embodiment 6

Mode according to embodiment 5 is tested, different is, 100 parts of (weight) cement and 20 parts (weight) are contained calcium aluminum fluoride be mixed into fluorine-containing cement, then with 100 parts of (weight) fluorine-containing cement, shown in the table 6 to the amount of gypsum in 100 parts of (weight) fluorine-containing cement, be mixed into gunning concrete with 0.5 part (weight) sclerosis retarding agent, press the accelerating chemicals of shown in the table 6 the content adding of per 100 parts of (weight) fluorine-containing cement being made up of calcium aluminate, produce fast hard gunning concrete thus.The results are shown in table 6.

Table 6

Test No.	Amount of gypsum *1	Accelerating chemicals *2	Ultimate compression strength (N/mm 2)					Annotate
									1h	3h	1d	7d	28d
			6-1 6-2 6-3	10 10 10	0 5 10	0.0 1.7 3.0	0.0 4.3 6.0							- 14.2 16.0	19.7 31.7 32.6	44.6 49.5 53.0	Contrast contrast contrast
6-4	0	0						0	0	-	14.0	39.5	Contrast

6-5 6-6	10 25	0 0	0 0	0 0	- 9.8	28.4 31.2	49.8 57.0	The contrast contrast
									6-7 6-8 6-9	0 10 25	5 5 5	0.4 1.9 3.1	1.2 6.5 7.8	11.9 19.6 21.2	28.6 34.0 40.0	39.7 52.3 58.6	Edition with parallel text invention the present invention
6-10 6-11 6-12 6-13 6-14 6-15	0 1 5 10 20 25	10 10 10 10 10 10	2.0 2.1 3.1 5.5 6.9 6.3	3.6 3.6 7.0 9.4 10.1 10.9	15.0 15.2 17.5 23.0 25.8 26.2	33.1 34.0 38.2 41.3 47.4 50.2	36.9 37.3 52.6 58.4 59.4 60.7	The edition with parallel text invention is of the present invention
									6-16 6-17 6-18	0 10 25	20 20 20	3.8 7.0 10.6	4.5 11.1 15.1	19.4 30.0 39.3	37.4 53.1 54.5	35.7 60.1 58.0	Edition with parallel text invention the present invention

● " h " expression " hour ", " d " expression " my god "

● this 6-3 of test No. 6-1 represents is knot when replacing fluorine-containing cement with ordinary Portland cement

Really

^*The umber (weight) of the gypsum of cement composition in 1 pair of per 100 parts of (weight) the fluorine-containing cement

^*The umber (weight) of the accelerating chemicals of 2 pairs of per 100 parts of (weight) fluorine-containing cement

Comparative examples 1

Test according to the mode among the embodiment 5, different is, 100 parts of (weight) cement and 20 parts (weight) are contained calcium aluminum fluoride be mixed into fluorine-containing cement, and with fluorine-containing cement, gypsum, sclerosis retarding agent and accelerating chemicals are mediated simultaneously.

Ultimate compression strength after 1 hour is 4.9N/mm ², after 3 hours is 8.9N/mm ², after 1 day is 22.5N/mm ², after 7 days is 40.6N/mm ², after 28 days is 57.4N/mm ²But in this comparative examples, spraying beginning back several minutes causes the spout internal diameter to dwindle because of cured product is deposited on the filling tube inwall, and when continuing spraying, filling tube can stop up in 10 to 20 minutes.

Comparative examples 2

Continue test according to the mode of embodiment 5, different is, 100 parts of (weight) cement and 20 parts (weight) is contained calcium aluminum fluoride be mixed into fluorine-containing cement, and then with fluorine-containing cement, sclerosis retarding agent and accelerating chemicals are pre-mixed, again by Y pipe adding gypsum.

Ultimate compression strength after 1 hour is 4.3N/mm ², after 3 hours is 8.1N/mm ², after 1 day is 12.0N/mm ², after 7 days is 39.9 N/mm ², after 28 days is 56.2N/mm ²But, in edition with parallel text embodiment, the flowability that is difficult to regulate cement because in fluorine-containing cement, add accelerating chemicals, similar to the situation in the comparative examples 1, filling tube can stop up at short notice.

Comparative examples 3

Mode according to embodiment 5 is tested, different is, 100 parts of (weight) cement and 20 parts (weight) are contained calcium aluminum fluoride be mixed into fluorine-containing cement, then fluorine-containing cement and sclerosis retarding agent are pre-mixed, add accelerating chemicals and the gypsum that is pre-mixed by Y pipe again.

Ultimate compression strength after 1 hour is 4.1N/mm ², in the time of 3 hours is 7.4N/mm ², after 1 day is 21.5N/mm ², after 7 days is 38.7N/mm ², after 28 days is 54.5N/mm ²But in this comparative examples, the consumption per hour of gypsum and accelerating chemicals mixture increases, and the spraying operation has to interrupt owing to lacking accelerating chemicals, and the consumption of accelerating chemicals is greatly to 20kg, and the present invention only needs 10kg.

Embodiment 7

Prepare gunning concrete according to the mode among the embodiment 1, different is that the material of the unit vol of using is 450kg/m ³Cement, 1030kg/m ³Fine aggregate and 697kg/m ³Coarse aggregate, with 100 parts of (weight) cement, the phosphoric acid salt of 10 parts of (weight) gypsum and the amount of Table 7 is mixed into gunning concrete.Measure the change in time of gunning concrete slump.The results are shown in table 7.

Used material

Phosphoric acid salt A: tripoly phosphate sodium STPP, commercial goods

Phosphoric acid salt B: uncle's sodium phosphate, commercial goods

Measuring method

Slump: according to JIS A1101

Table 7

Test No.	Phosphoric acid salt	Slump (cm)
							At first	10 minutes	20 minutes	30 minutes	40 minutes
		7-1	- 0.0	7.0	6.0	5.5						1.0	0.0
7-2 7-3 7-4 7-5 7-6 7-7	A 0.05 A 0.2 A 0.5 A 1.0 A 3.0 A 5.0						8.0 13.0 16.5 19.0 22.0 24.0	8.0 13.0 16.5 19.0 22.0 24.0	7.0 12.5 16.5 19.0 22.0 24.0	5.5 11.5 16.0 19.0 22.0 24.0	4.0 11.0 15.0 18.0 21.5 23.5
		7-8 7-9 7-11	B 0.05 B 0.2 B 0.5	9.0 14.5 17.0	9.0 14.5 17.0	8.5 14.0 17.0						7.5 13.0 16.5	6.0 11.5 16.0

7-10 7-12 7-13

B 1.0 B 3.0 B 5.0

20.5 23.0 ≥25

20.5 23.0 ≥25

20.5 23.0 25.0

20.5 23.0 25.0

20.0 22.5 24.5

● " phosphoric acid salt " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 8

Test according to the mode among the embodiment 1, different is that the material of the unit vol of using is 450kg/m ³Cement, 1030kg/m ³Fine aggregate and 697kg/m ³Coarse aggregate, with 100 parts of (weight) cement, the phosphoric acid salt A of 10 parts of (weight) gypsum and the amount of Table 8 is mixed into gunning concrete, and per 100 parts of (weight) cement add 10 parts of accelerating chemicalss that (weight) is made of calcium aluminate, produce fast hard gunning concrete thus, the results are shown in table 8.

Table 8

Test No.	Phosphoric acid salt	Ultimate compression strength (N/mm 2)					Annotate
								1h	3h	1d	7d	28d
		8-1	0.0	3.5	6.6	17.0							33.1	54.1	The present invention
8-1 8-2 8-3 8-4 8-5 8-6 8-7	0.05 0.1 0.2 0.5 1.0 3.0 5.0						3.5 3.5 3.5 3.4 3.0 2.5 1.5	6.5 6.5 6.4 6.2 5.7 5.0 3.0	17.0 17.0 17.0 17.0 16.6 16.0 15.1	33.0 33.0 32.9 32.8 32.2 32.0 31.4	53.9 53.9 53.5 54.0 53.0 53.4 49.0	The present invention of the present invention of the present invention

● " h " expression " hour ", " d " expression " my god "

● " phosphoric acid salt " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 9

Mode according to embodiment 1 is tested, different is, with 100 parts of (weight) cement, the amine of 25 parts of (weight) gypsum and the amount of Table 9 is mixed into gunning concrete, per then 100 parts of (weight) cement add 20 parts of accelerating chemicalss that (weight) is made of calcium aluminate, produce fast hard gunning concrete thus.The results are shown in table 9.

Used material

Amine A: commercially available trolamine

Amine B: commercially available monoethanolamine

Measuring method

Bounding force: fast hard gunning concrete is sprayed on the framework, when coating thickness reaches about 3cm, utilizes the concrete after vibrator will spray to vibrate 30 seconds, thus, observe and peel off phenomenon, bounding force is evaluated as " poor ", do not peel off, be evaluated as " good ".

Table 9

Test No.	Amine	Ultimate compression strength (N/mm 2)					Bounding force	Annotate
									1h	3h	1d	7d	28d
		9-1 9-2 9-3 9-4 9-5 9-6	- 0.0 A 0.5 A 1.0 A 2.0 A 5.0 A 10	7.2 7.4 7.0 7.1 7.2 7.0	10.3 10.0 10.1 10.3 10.5 10.0	22.1 22.5 22.3 22.4 23.0 23.1								41.8 42.2 42.5 42.9 43.0 43.2	53.0 54.9 57.0 58.9 63.7 63.3	Difference is good carefully carefully	Of the present invention of the present invention
9-7 9-8 9-9 9-10 9-11	B 0.5 B 1.0 B 2.0 B 5.0 B 10						7.3 7.2 7.2 7.3 7.2	10.5 10.3 10.3 10.3 10.4	22.4 23.0 22.8 22.7 22.9	42.1 42.0 42.8 42.3 41.9	55.0 57.3 59.0 61.8 62.5	Carefully well carefully	The present invention of the present invention

● " h " expression " hour ", " d " expression " my god "

● " amine " is by the parts by weight of per 100 parts of (weight) cement are represented

● bounding force " poor " refers to concrete forming difference and sagging, and " good " refers to that concrete forming is good and sagging hardly

Embodiment 10

Mode according to embodiment 1 is tested, different is, with 100 parts of (weight) cement, the depositing dust agent of 10 parts of (weight) gypsum and the amount of Table 10 is mixed into gunning concrete, per then 100 parts of (weight) cement add 10 parts of accelerating chemicalss that (weight) is made of calcium aluminate, produce fast hard gunning concrete thus.The results are shown in table 10.

Used material

Depositing dust agent a: commercially available methylcellulose gum

Depositing dust agent b: commercially available vinyl acetate/ethylene copolymer

Depositing dust agent c: commercially available Sodium L-arginate

Measuring method

Dust Capacity: at the 3.5m height, 2.5m is wide, makes in the arciform simulation tunnel, with 4m with iron plate ³The fast hard spraying cement of the flow velocity spraying of/hr 30 minutes was measured Dust Capacity every 10 minutes in the place of distance spraying point 3m, provided the mean value of measured value then.

Table 10

Test No.	The depositing dust agent	Dust Capacity	Annotate
				10-1	- 0.0	21.6	The present invention
10-2 10-3 10-4 10-5 10-6	a 0.01 a 0.05 a 0.1 a 0.5 a 1.0	9.7 3.0 1.7 0.9 0.9	The present invention of the present invention
				10-7 10-8 10-9 10-10 10-11	b 0.01 b 0.05 b 0.1 b 0.5 b 1.0	10.3 4.1 2.0 0.8 0.7	The present invention of the present invention
10-12 10-13 10-14 10-15 10-16	c 0.01 c 0.05 c 0.1 c 0.5 c 1.0	8.9 2.1 1.1 0.5 0.3	The present invention of the present invention

● " depositing dust agent " is by the parts by weight of per 100 parts of (weight) cement are represented

● Dust Capacity is with mg/m ³Expression

Embodiment 11

Mode according to embodiment 1 is tested, different is, with 100 parts of (weight) cement, the filamentary material of 10 parts of (weight) gypsum and the amount of Table 11 is mixed into gunning concrete, and per then 100 parts of (weight) cement add the accelerating chemicals that 10 parts (weight) be made of calcium aluminate and produce fast hard gunning concrete.The results are shown in table 11.

Used material

Filamentary material A: vinylon fiber, by Kuraray Co., Ltd. makes, staple length: 30mm

Filamentary material B: steel fiber, by Kobe Steel Co., Ltd. makes, staple length: 30mm

Filamentary material C: vinylon fiber, by Kuraray Co., Ltd. makes, staple length: 0.5mm

Filamentary material D: vinylon fiber, by Kuraray Co., Ltd. makes, staple length: 10mm

Filamentary material E: vinylon fiber, by Kuraray Co., Ltd. makes, staple length: 50mm

Measuring method

Shock strength: 20cm is wide * sample that 20cm length * 1cm is thick takes from the gunning concrete after 1 hour, place it on the standard sand flat board, the ball of a heavy 100g by the 50cm eminence fall with its on.Sample 5 times with interior cracked be rated for " * ", still indehiscent sample or not cracked moulded product are rated for " zero " more than 5 times.

Table 11

Test No.	Filamentary material	Shock strength	Ultimate compression strength (N/mm 2)					Annotate
									1h	3h	1d	7d	28d
			11-1	- 0	×	3.0	6.0							16.0	32.6	53.0	The present invention
11-2 11-3 11-4 11-5 11-6	A 0.5 A 1.0 A 2.0 A 5.0 A 7.0	○ ○ ○ ○ ○						3.1 3.1 3.1 3.2 3.1	6.2 6.1 6.2 6.3 6.2	16.5 16.5 16.9 17.9 16.8	33.0 33.4 33.4 33.6 33.5	53.4 53.8 54.0 54.2 53.8	The present invention of the present invention
			11-7 11-8 11-9 11-10 11-11	B 0.5 B 1.0 B 2.0 B 5.0 B 7.0	○ ○ ○ ○ ○	3.0 3.1 3.2 3.2 3.0	6.1 6.2 6.2 6.3 6.2							16.3 16.6 17.1 17.0 16.8	31.6 31.8 32.3 32.1 32.2	53.8 53.8 54.6 54.8 53.7	The present invention of the present invention
11-12 11-13 11-14	C 2.0 D 2.0 E 2.0	○ ○ ○						3.3 3.2 3.0	6.3 6.1 6.0	17.1 17.0 16.2	33.6 33.2 32.3	54.2 53.8 52.5	The present invention of the present invention

● " h " expression " hour ", " d " expression " my god "

● " filamentary material " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 12

Mode according to embodiment 1 is tested, and different is that the material of the unit vol of use is 450kg/m ³Cement, 1030kg/m ³Fine aggregate and 697kg/m ³Coarse aggregate, with 100 parts of (weight) cement, the sulphite of 10 parts of (weight) gypsum and the amount of Table 12 is mixed into gunning concrete, and per 100 parts of (weight) cement add the accelerating chemicals that 10 parts (weight) are made of calcium aluminate, produce fast hard gunning concrete thus.But, for the spraying after concrete, mensuration be slump change in time.The results are shown in table 12.

Used material

Sulphite A: potassium sulfite, commercial goods

Sulphite B: sodium bisulfite, commercial goods

Sulphite C: Sodium Pyrosulfite, commercial goods

Table 12

Test No.	Sulphite	Slump (cm)			Ultimate compression strength (N/mm 2)					Annotate
											At first	30 minutes	60 minutes	1h	3h	1d	7d	28d
		12-1	0	7.0	1.5	-	3.0	6.0	16.2										33.3	53.2	The present invention
12-2 12-3	A 0.05 A 0.07									9.0 10.0	8.0 8.5	4.0 4.5	3.6 4.1	7.9 8.5	18.0 19.7	38.6 39.8	54.9 56.1	Of the present invention

12-4 12-5 12-6	A 0.5 A 1.0 A 2.0	13.5 17.0 20.5	10.5 15.0 18.5	6.5 12.5 17.0	5.4 6.0 6.1	9.1 10.0 10.4	20.8 23.1 22.8	41.7 43.0 42.8	59.3 61.7 61.3	The present invention of the present invention
											12-7 12-8 12-9 12-10 12-11	B 0.05 B 0.07 B 0.5 B 1.0 B 2.0	8.5 9.0 12.0 15.1 19.0	7.0 7.5 9.5 12.0 17.5	1.0 2.5 7.0 9.0 15.5	3.4 3.9 4.5 5.0 5.0	7.3 7.5 8.0 9.0 8.9	17.9 18.6 19.9 20.7 21.0	36.7 40.1 42.4 43.1 43.0	55.1 56.1 58.2 60.4 60.4	The present invention of the present invention
12-12 12-13 12-14 12-15 12-16	C 0.05 C 0.07 C 0.5 C 1.0 C 2.0	8.5 9.0 12.0 15.0 18.0	6.5 7.5 9.0 11.5 17.0	1.0 2.0 7.0 9.5 13.5	3.6 4.0 5.0 5.5 5.6	7.7 8.1 8.8 9.2 9.2	18.7 19.5 20.7 21.5 21.6	39.0 40.6 42.0 43.1 43.4	54.0 55.8 58.0 60.0 60.1	The present invention of the present invention

● " h " expression " hour ", " d " expression " my god "

● " sulphite " is by the parts by weight of per 100 parts of (weight) cement are represented

● "-" expression " can't record " of slump

Embodiment 13

Mode according to embodiment 1 is tested, different is, 100 parts of (weight) cement and 15 parts of (weight) gypsum are mixed into gunning concrete, per 100 parts of (weight) cement add 10 parts of (weight) accelerating chemicalss, this accelerating chemicals is mixed by the alkali metal aluminate of 100 parts of (weight) calcium aluminates and the amount of Table 13 or alkaline carbonate, produces fast hard gunning concrete thus.The results are shown in table 13.

Used material

Alkali metal aluminate: commercially available sodium aluminate

Alkaline carbonate: commercially available yellow soda ash

Table 13

Test No.	Alkali metal aluminate	Alkaline carbonate	Ultimate compression strength (N/mm 2)
								1h	3h	1d	7d	28d
			13-1 13-2 13-3 13-4 13-5 13-6 13-7 13-8	0.0 0.1 1.0 2.0 5.0 10.0 25 30	0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0	3.4 4.0 4.3 4.5 4.6 4.8 5.2 5.4	6.6 7.0 7.4 7.6 7.9 8.3 8.4 8.8						17.5 19.3 19.5 20.8 21.6 23.1 24.5 24.0	38.4 39.2 40.6 41.2 42.7 43.1 42.2 41.9	55.0 55.0 55.2 55.5 56.3 58.4 59.7 57.4

13-9 13-10 13-11	40 50 55	0.0 0.0 0.0	5.7 6.3 6.4	8.9 9.2 9.5	23.0 22.8 23.6	41.3 37.4 35.4	53.2 50.6 48.8
								13-12 13-13 13-14 13-15 13-16 13-17	0.0 0.0 0.0 0.0 0.0 0.0	0.5 1.0 10.0 50 100 200	4.0 4.5 5.3 7.5 7.7 8.4	7.2 8.8 10.2 10.7 11.6 11.9	19.4 19.9 23.3 24.4 24.5 24.8	38.8 39.6 41.9 43.2 38.0 37.2	55.2 56.0 58.2 60.3 57.0 43.0
13-18	10.0	30	8.0	12.2	24.7	42.2	60.5

● " h " expression " hour ", " d " expression " my god "

● " alkali metal aluminate " and " alkaline carbonate " is by the parts by weight of per 100 parts of (weight) cement are represented

In order to contrast, in sand-cement slurry, do not add gypsum, will be by 100 parts of (weight) calcium aluminates, the accelerating chemicals that 100 parts of (weight) gypsum and 10 parts of (weight) sodium aluminates mix adds by 400kg/m by a force air feeding accelerating chemicals interpolation equipment ³Cement, 1055kg/m ³Fine aggregate, 713kg/m ³Coarse aggregate and 200kg/m ³In the concrete that water is formed, spray this mixture.

As a result, for the provide strength property identical with test No. 13-6 is provided, must add 20 parts of (weight) accelerating chemicalss at least, this is the twice of test 13-6 aequum at least.In addition, the dust situation is serious in the construction, and must interrupt spraying with additional accelerating chemicals in accelerating chemicals interpolation equipment, and the line clogging in the spraying process is frequent to the degree that makes that operation can't be carried out.

Embodiment 14

Mode according to embodiment 1 is mixed dry concrete, and different is, per 100 parts of (weight) cement add 15 parts of (weight) gypsum, and gypsum is transported to spraying robot by travelling belt.

The accelerating chemicals that 100 parts of (weight) calcium aluminates and 10 parts of (weight) alkali metal aluminates are mixed adds on travelling belt in the dry concrete, and it is to be in the concrete per 100 parts of 10 parts of (weight) cement (weight) thus.

The dry concrete that is added with accelerating chemicals by spraying robot, is utilized the air pressure feeding, and per therein 100 parts of (weight) cement add 50 parts of (weight) water, do spraying then and operate.

As a result, do not have the trouble of line clogging and so on during the spraying operation is carried out, the ultimate compression strength of spraying back material is 4.1N/mm after 1 hour after measured ², be 58.5N/mm after 28 days ²

In order to contrast, spray operation in the manner described above, different is, per 100 parts of (weight) cement add 20 parts (weight) by 100 parts of (weight) calcium aluminates in not gypseous dry concrete, 100 parts of (weight) dehydrated gyp-s and 10 parts of accelerating chemicalss that (weight) alkali metal aluminate mixes.

As a result, form a large amount of dust, occurred filling tube obstruction several times after beginning to spray, thereby can not operate well.

Embodiment 15

Do the spraying operation according to the mode of embodiment 14, different is that the material of the unit vol of use is 400kg/m ³100 parts of (weight) cement and 20 parts (weight) are contained the fluorine-containing cement that calcium aluminum fluoride mixes, the gypsum of the cement 10 parts (weight) in 100 parts of (weight) fluorine-containing cement and per 100 parts of (weight) fluorine-containing cement is mixed into dry concrete, and the cement in per 100 parts of (weight) fluorine-containing cement adds 10 parts of (weight) accelerating chemicalss.

As a result, do not have the trouble of line clogging and so on when spraying operation, the ultimate compression strength of spraying back material is 8.0N/mm after 1 hour after measured ², be 70.5N/mm after 28 days ²

Embodiment 16

Mode according to embodiment 1 is tested, different is, with 100 parts of (weight) cement, the high-performance water reducing agent α of 10 parts of (weight) gypsum and the amount of Table 14 is mixed into gunning concrete, per 100 parts of (weight) cement add 10 parts (weight) by 100 parts of (weight) calcium aluminates and 10 parts of accelerating chemicalss that (weight) alkali aluminate metal-salt mixes, and produce fast hard gunning concrete thus.The results are shown in table 14.

Used material

Water reducer α: commercially available high-performance water reducing agent, major ingredient: sodium naphthalene sulfonate

Table 14

Test No.	Water reducer	Ultimate compression strength (N/mm 2)
					1h	1d	28d
		16-1 16-2 16-3 16-4 16-5 16-6	0.05 0.1 0.5 1.0 2.0 3.0	3.9 3.9 3.8 3.5 2.9 1.9				22.2 21.3 21.4 21.3 20.2 19.4	52.1 51.9 51.6 52.0 51.5 51.4

● " h " expression " hour ", " d " expression " my god "

● " water reducer " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 17

Mode according to embodiment 1 is tested, different is, with 100 parts of (weight) cement, 10 parts of (weight) gypsum, the sclerosis retarding agent of the amount of Table 15 or sclerosis accelerating chemicals are mixed into gunning concrete, per again 100 parts of (weight) cement add 10 parts (weight) by 100 parts of (weight) calcium aluminates and 10 parts of accelerating chemicalss that (weight) alkali metal aluminate mixes, and produce fast hard gunning concrete thus.The results are shown in table 15.

Used material

Sclerosis retarding agent B: alkaline carbonate, yellow soda ash, commercial goods

Sclerosis retarding agent C: alkaline carbonate, sodium bicarbonate, commercial goods

Sclerosis accelerating chemicals: white lime, commercial goods

Table 15

Test No.	Sclerosis retarding agent (parts by weight)	The sclerosis accelerating chemicals	Ultimate compression strength (N/mm 2)
						1h	1d	28d
			17-1 17-2 17-3 17-4	- 0.0 A 0.1 A 1.0 A 10.0	0.0 0.0 0.0 0.0				2.0 2.4 2.2 2.0	18.8 20.4 19.5 17.4	51.4 54.0 50.8 51.6
17-5 17-6 17-7 17-8	B 0.1 B 1.0 B 10.0 A1.0 B 1.0	0.0 0.0 0.0 0.0				2.5 2.9 4.0 2.8	21.6 22.8 23.0 23.8	52.8 53.4 54.9 52.9
			17-9 17-10 17-11 17-12	C 0.1 C 1.0 C 10.0 A 1.0 C 2.0	0.0 0.0 0.0 0.0				2.5 2.7 3.0 3.0	20.8 21.6 22.0 22.0	50.8 52.8 51.4 53.5
17-13 17-14 17-15 17-17	- 0.0 - 0.0 - 0.0 A 1.0	0.1 1.0 10.0 5.0				2.2 2.4 2.8 2.8	21.6 20.8 22.5 23.5	54.5 53.6 54.2 51.9

● " h " expression " hour ", " d " expression " my god "

● " sclerosis retarding agent " and " sclerosis accelerating chemicals " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 18

Mode according to embodiment 1 is tested, different is, with 100 parts of (weight) cement, 10 parts of (weight) gypsum, the ultrafine powder of 1 part of (weight) water reducer β and the amount of Table 16 is mixed into gunning concrete, per 100 parts of (weight) cement add 10 parts (weight) by 100 parts of (weight) calcium aluminates and 10 parts of accelerating chemicalss that (weight) alkali metal aluminate mixes, and produce fast hard gunning concrete thus.The results are shown in table 16.

Used material

Water reducer β: commercially available high-performance water reducing agent, major ingredient: poly carboxylic acid sodium

Ultrafine powder A: commercially available fine powder slag, Blang's specific surface: 6,500cm ²/ g, average particulate diameter: 4 μ m

Ultrafine powder B: silica powder, commercial goods, average particulate diameter: 10 μ m at the most

Ultrafine powder C: kaolin, commercial goods, average particulate diameter: 10 μ m at the most

Ultrafine powder D: methyl kaolin, commercial goods, average particulate diameter: 10 μ m at the most

Measuring method

Resilience ratio: with 4m ³The speed of/hr is with the simulation tunnel that fast hard gunning concrete was sprayed in 30 minutes the wide 2.5mm of high 3.5mm.After spraying finishes, measure the gunning concrete amount that does not have to adhere to and fall, and be calculated as follows the resilience ratio:

Used gunning concrete amount * 100 (%) of gunning concrete amount/spraying that do not adhere to during resilience ratio=spraying and fall

Table 16

Test No.	Ultrafine powder	Resilience is than (%)
			18-1 18-2 18-3 18-4	A 0 A 2 A 10 A 30	24.3 20.5 15.4 10.6
18-5 18-6 18-7	B 2 B 10 B 30	18.8 4.0 2.0
			18-8	C 10	7.0
18-9	D 10	3.6

● " ultrafine powder " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 19

Mode according to embodiment 18 is tested, and different is, with 100 parts of (weight) cement, 10 parts of (weight) gypsum, 10 parts of (weight) ultrafine powder B, 1 part (weight) sclerosis retarding agent A, 2 parts (weight) sclerosis retarding agent B and 0.5 part (weight) sclerosis accelerating chemicals are mixed into gunning concrete.

As a result, the dust that the fast hard gunning concrete that can prepare thus produces is few, resilience than little to 3.6%.

After this fast hard gunning concrete spraying, the intensity after 1 hour is 3.0N/mm ², the intensity after 28 days is 59.5N/mm ²Thus, can obtain all very high high-performance spray concrete of initial stage and longterm strength.

Embodiment 20

Mode according to embodiment 18 is tested, and different is, with 100 parts of (weight) cement, 10 parts of (weight) gypsum, 1.0 part (weight) water reducer β, the sclerosis retarding agent and the sclerosis accelerating chemicals of 10 parts of (weight) ultrafine powder D and the amount of Table 17 are mixed into gunning concrete, with 2.5m ³The spraying rate of/hr sprays.The results are shown in table 17.

Table 17

Test No.	The sclerosis retarding agent	The sclerosis accelerating chemicals	Resilience is than (%)	Dust	Ultimate compression strength (N/mm 2)
							1h	28d
					20-1 20-2 20-3	A 1.0 - 0.0 A 1.0			0.0 1.0 1.0	3.2 4.0 3.1	Trace trace trace	2.7 3.3 3.6	61 57 63

● " h " expression " hour ", " d " expression " my god "

● " sclerosis retarding agent " and " sclerosis accelerating chemicals " is by the parts by weight of per 100 parts of (weight) cement are represented

● ultimate compression strength is with N/mm ²Expression

Embodiment 21

Mode according to embodiment 1 is tested, different is, the cement of the unit vol of using is pressed shown in the table 18, water consumption to per 100 parts of (weight) cement is pressed shown in the table 18,100 parts of (weight) cement and 10 parts of (weight) gypsum are mixed into gunning concrete, per 100 parts of (weight) cement add 10 parts (weight) by the accelerating chemicals that 100 parts of (weight) calcium aluminates and alkali metal aluminate mix, and produce fast hard gunning concrete thus.For gunning concrete, the slump after measuring it and just having mediated.The results are shown in table 18.

Table 18

Test No.	Cement	Water	Slump (cm)	Ultimate compression strength (N/mm 2)			Annotate
								1h	1d	28d
				21-1 21-2 21-3 21-4 21-5	550 500 450 400 380	35 40 45 50 60					4.0 7.0 7.5 8.0 12.0	6.8 5.7 5.1 4.8 3.0	32.9 26.7 24.7 23.1 15.8	73.8 65.7 61.0 58.4 46.8	The present invention of the present invention

● " h " expression " hour ", " d " expression " my god "

● cement amount is with kg/m ³Expression

● " water " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 22

With Blang's specific surface is 5000cm ²The gypsum of/g and calcium aluminate are respectively charged in the bag, in 20 ℃, humidity 60% preservation.During use, be the sand-cement slurry of cement/fine aggregate=1/3 with gypsum and cement mixing and formation ratio, per 100 parts of (weight) cement a use 60 parts of (weight) water.This mortar and calcium aluminate are mixed into fast hard mortar.Depositing by Blang's specific surface in the same manner is 5000cm ²The mixture that the gypsum of/g and calcium aluminate mix.During use, per 100 parts of (weight) cement a are with 60 parts of (weight) water, and the preparation ratio is the mortar of cement/fine aggregate=1/3.This mortar and mixture are mixed with fast hard mortar.In order to compare package stabilities of these fast hard mortars, carry out the sclerosis test of mortar.The total amount of calcium aluminate and gypsum is per 100 parts (weight) 15 parts (weight).The results are shown in table 19.

Measuring method

Sclerosis test: measure at 20 ℃ according to Pu Shi resistance test (proctor resistance test) (ASTM C 403).

Table 19

Test No.	Gypsum	The indoor shelf time	First setting time (second)			Last setting time (minute)
									Z	II	Difference	I	II	Difference
			22-1 22-2 22-3 22-4 22-5	100 100 100 100 100	01 months 3 months 6 months 1 year	30 63 182 220 300	25 25 25 25 25	-5 -38 -160 -195 -275							10 15 20 27 30	10 10 10 10 10	-0 -3 -7 -15 -18
22-6 22-7 22-8 22-9 22-10	150 150 150 150 150	01 months 3 months 6 months 1 year							38 86 220 310 485	35 35 35 35 35	-3 -51 -185 -275 -450	12 23 30 38 55	12 12 12 12 12	-1 -9 -19 -24 -44

● " gypsum " is by the parts by weight of per 100 parts of (weight) calcium aluminates are represented

● " I " the expression gypsum of " initial setting time " and " last setting time " and the situation that calcium aluminate is pre-mixed

● " II " of " initial setting time " and " last setting time " represents gypsum and calcium aluminate blended situation just in use

Embodiment 23

The unit material that uses is 400kg/m ³Cement, 1055 fine aggregates, 713 coarse aggregates and 200 water become gunning concrete with these mixing of materials, " Ariber 280 " the board spraying machine pressure feed that utilizes Ariber Company to make.

In a mid-way, connect two Y tubes, by wherein one the tunnel utilizing air pressure to send into the accelerating chemicals of forming by calcium aluminate, shown in table 20 to the dosage of per 100 parts of (weight) cement, utilize air to send into gypsum by another pipe pressure, per 100 parts (weight) add 10 parts of cement.Utilize this combined mixture, with 4m ³The flow velocity of/hr sprays operation, measures the ultimate compression strength in each stage.The results are shown in table 20.

Table 20

Test No.	Accelerating chemicals	Ultimate compression strength (N/mm 2)				Annotate
							1h	1d	7d	28d
		23-1	0.0	0.0	-						18.0	45.1	Contrast
23-2 23-3 23-4 23-5 23-6 23-7	1.0 2.0 5.0 10 15 20					0.1 0.4 1.8 3.1 3.7 4.5	- - 13.9 15.0 17.5 20.0	18.3 22.5 30.7 33.1 37.4 41.2	45.2 45.8 50.4 52.8 53.9 56.5	Of the present invention of the present invention

● " h " expression " hour ", " d " expression " my god "

● " accelerating chemicals " is by the parts by weight of per 100 parts of (weight) cement are represented

● "-" expression of " ultimate compression strength " can't be taken a sample because of undercapacity

Comparative examples 4

Mode according to embodiment 23 prepares and the pressure feed gunning concrete, in a mid-way, be connected into a Y tube, utilize air pressure to send into the accelerating chemicals that constitutes by calcium aluminate and gypsum thus, per 100 parts of (weight) cement add 10 parts (weight), and they are pre-mixed.Then, utilize this mixture, with 4m ³The flow velocity of/hr sprays.As a result, fast hardening concrete solidifies in back 5 minutes of kneading, can't spray.

Comparative examples 5

Mode according to embodiment 23 prepares gunning concrete, gypsum of per 100 parts of (weight) cement 10 parts (weight) and the accelerating chemicals of per 100 parts of (weight) cement 10 parts (weight) is mixed and pressure feed, with 4m ³The flow velocity of/hr sprays, and measures ultimate compression strength according to the mode of embodiment 1 then.As a result, the ultimate compression strength after 1 hour is 3.0N/mm ², after 28 days is 52.0N/mm ²

In addition,, begin in filling tube, to deposit, filling tube is stopped up by curing material along with the past of spray time.

Embodiment 24

Mode according to embodiment 23 is tested, and different is, 10 parts of (weight) per 100 parts of (weight) calcium aluminates of per 100 parts of (weight) cement mixing mix with the alkali metal aluminate of press amount shown in the table 21 or alkaline carbonate preparation and must accelerating chemicals.The results are shown in table 21.

Table 21

Test No.	Alkali metal aluminate	Alkaline carbonate	Ultimate compression strength (N/mm 2)
							1h	1d	7d	28d
			24-1	0.0	0.0	3.1					15.0	33.1	52.8
24-2 24-3 24-4 24-5 24-6	0.1 5.0 10 20 50	0.0 0.0 0.0 0.0 0.0					3.5 4.0 4.3 4.6 5.2	17.8 19.9 20.8 22.1 21.3	37.0 40.2 41.6 40.8 36.5	51.1 54.8 55.7 55.0 49.0
			24-7 24-8 24-9 24-10 24-11 24-12	0 0 0 0 0 0	0.5 1.0 10 50 100 200	3.4 4.0 4.6 7.0 7.1 7.5					16.8 18.0 18.4 22.4 22.3 22.5	35.0 36.2 37.7 40.0 37.7 36.4	53.1 54.8 56.8 57.5 55.1 40.4

● " h " expression " hour ", " d " expression " my god "

● " alkali metal aluminate " and " alkaline carbonate " is by the parts by weight of per 100 parts of (weight) cement are represented

Embodiment 25

Mode according to embodiment 1 is tested, different is, 100 parts of (weight) cement and 10 parts of (weight) gypsum are mixed into gunning concrete, per 100 parts of (weight) cement mixing 10 parts (weight) are produced fast hard gunning concrete thus with the accelerating chemicals that the gypsum of measuring shown in 100 parts of (weight) calcium aluminates and the table 22 mixes.The results are shown in table 22.

Table 22

Test No.	Gypsum	Ultimate compression strength (N/mm 2)					Annotate
								1h	3h	1d	7d	28d
		25-1	0	3.0	6.0	16.0							32.6	53.0	The present invention
24-2 24-3 24-4 24-5	10 50 80 100						2.8 2.2 2.1 2.0	5.3 4.9 4.8 4.7	15.0 14.7 14.7 14.5	33.0 33.4 33.8 34.4	53.4 53.9 54.7 57.0	Of the present invention

24-6 25-7

150 200

1.7 1.0

4.5 4.0

14.2 12.0

35.0 33.2

57.1 54.4

Of the present invention

● " h " expression " hour ", " d " expression " my god "

● " gypsum " is by the parts by weight of per 100 parts of (weight) calcium aluminates are represented

Comparative examples 6

Mode according to embodiment 22 is tested, and different is, gypsum and calcium aluminate are pre-mixed, and to not on the same day 5 samples of blended carried out the sclerosis test.The results are shown in table 23.

When gypsum and calcium aluminate were pre-mixed, initial sclerosis and last setting time became very long, and until several days, this depended on the blended date, and can't obtain stable physical performance.So mixture can't use as the product that can approve.

Table 23

Test No.	Gypsum	The mixture piece	Store fate	Initial setting time (minute)	Last setting time (second)
						26-1 26-2	150 150	1	0 3	38 50	12 16
26-3 26-4	150 150	2	0 3	38 70	12 19
						26-5 26-6	150 150	3	0 3	38 100	12 27
26-7 26-8	150 150	4	0 3	38 40	12 14
						26-9 26-10	150 150	5	0 3	38 210	12 33

● " gypsum " is by the parts by weight of per 100 parts of (weight) calcium aluminates are represented

● mixture piece 1 to 5 is different on the mixing date

Utilize gunite of the present invention, the gunite of the mixed type that constitutes with the calcium aluminate type of routine or by calcium aluminate, alkali metal aluminate and/or alkaline carbonate is compared, and has the good performance that initial stage and longterm strength are provided.So, compare with conventional spraying method, can attenuate the thickness of spraying, shorten spray time, reduce quantity for spray, this is a very economical.

And the amount of the accelerating chemicals of Tian Jiaing can reduce half on the spot.Owing to can reduce the amount of adding accelerating chemicals on the spot, there is no need in spraying process, to interrupt the spraying operation, and can reduce the formation of dust in the spraying.

Cement when being pre-mixed the accelerating chemicals that forms by gypsum and calcium aluminate and mixing, can be improved package stability, if not product of the present invention then can't actually use.

By using fine powder cement can further significantly improve the performance that initial stage and longterm strength are provided.

By using fluorine-containing cement, can improve the performance that initial stage, medium and long term intensity are provided, and obstruction or accelerating chemicals performance that spout do not take place reduce, and can also reduce the resilience ratio.

Because phosphatic effect will have good flowability even reduce the consumption of water, thereby improve operating efficiency, because the obstruction of filling tube can take place thus hardly.

By mixing the depositing dust agent, can significantly reduce Dust Capacity, thereby improve construction environment.

By mixing filamentary material, can obtain the fast hard gunning concrete of shock strength or excellent spring.

By using sulphite, will have the good initial stage of passing through and the performance of longterm strength, reduce slump reduction in time thus.

When force feed was distinguished in cement, accelerating chemicals and construction, the infringement of gypsum to the accelerating chemicals quality can not take place.

And, by use by as the cement of major ingredient and gypsum and with calcium aluminate and gypsum as the sand-cement slurry spray material that the accelerating chemicals of major ingredient constitutes, can significantly improve the performance that initial stage and longterm strength are provided.At this moment,, the amount of the accelerating chemicals that mixes by calcium aluminate and gypsum can be significantly reduced, downgrade can be prevented thus owing in sand-cement slurry, mix gypsum.

Claims (8)

1. a gunite comprises 100 parts by weight of cement, and 1-20 weight part calcium aluminate type accelerating chemicals is with 1-25 weight part gypsum.

2. gunite according to claim 1,100 parts by weight of cement wherein and 1-25 weight part gypsum are formed premix, mix with the described calcium aluminate type of 1-20 weight part accelerating chemicals then.

3. gunite according to claim 1, described calcium aluminate type accelerating chemicals is a calcium aluminate.

4. gunite according to claim 1, described calcium aluminate type accelerating chemicals contain per 100 weight part calcium aluminate 10-200 weight part gypsum.

5. gunite according to claim 1, cement wherein are selected from the Blaine specific surface area greater than 3,200cm ²The fine powder cement of/g and the fluorine-containing cement that is added with calcium aluminum fluoride.

6. gunite according to claim 1, calcium aluminate type wherein coagulate agent and contain 100 weight part calcium aluminates, 1-50 weight part alkali metal aluminate and/or 0.5-200 weight part alkaline carbonate.

7. gunite according to claim 1 wherein also contains the phosphoric acid salt of per 100 parts by weight of cement 0.05-5 weight parts.

8. gunite according to claim 1, also comprise one or more mixing compositions that are selected from following material, these materials are: calculate by per 100 parts by weight of cement, 0.5-10 portions of amine by weight, the agent of 0.01-1 weight part depositing dust, 0.5-7 weight part filamentary material, 0.05-2 weight part sulphite, 0.05-3 weight part water reducer solid, 0.01-10 weight part sclerosis retarding agent, 0.05-20 weight part sclerosis accelerating chemicals and 1-100 weight part ultrafine powder.